Add UMA stats for new Print Preview UI elements.

chrome/browser/resources/print_preview/metrics.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 cr.define('print_preview', function() {
   'use strict';
 
   /**
    * Object used to measure usage statistics.
    * @constructor
@@ skipping 25 matching lines @@
     // Privet and cloud printers.
     CLOUD_DUPLICATE_SELECTED: 6,
     // Used when a user sees a register promo for a cloud print printer.
     REGISTER_PROMO_SHOWN: 7,
     // Used when a user selects a register promo for a cloud print printer.
     REGISTER_PROMO_SELECTED: 8,
     // User changed active account.
     ACCOUNT_CHANGED: 9,
     // User tried to log into another account.
     ADD_ACCOUNT_SELECTED: 10,
+    // User accepted printer sharing invitation.
+    INVITATION_ACCEPTED: 11,

[Vitaly Buka (NO REVIEWS), 2014/09/23 23:46:36]

probably you also need INVITATION_AVAILIBLE counter.

[Aleksey Shlyapnikov, 2014/09/24 00:43:14]

Done.

+    // User rejected printer sharing invitation.
+    INVITATION_REJECTED: 12,
     // Max value.
-    DESTINATION_SEARCH_MAX_BUCKET: 11
+    DESTINATION_SEARCH_MAX_BUCKET: 13
   };
 
   /**
    * Enumeration of buckets that a user can enter while using the Google Cloud
    * Print promotion.
    * @enum {number}
    */
   Metrics.GcpPromoBucket = {
     // Used when the Google Cloud Print promotion (shown above the PDF preview
     // plugin) is shown to the user.
@@ skipping 10 matching lines @@
 
   /**
    * Print settings UI usage metrics buckets.
    * @enum {number}
    */
   Metrics.PrintSettingsUiBucket = {
     // Advanced settings dialog is shown.
     ADVANCED_SETTINGS_DIALOG_SHOWN: 0,
     // Advanced settings dialog is closed without saving a selection.
     ADVANCED_SETTINGS_DIALOG_CANCELED: 1,
+    // 'More/less settings' expanded.
+    MORE_SETTINGS_CLICKED: 2,
+    // 'More/less settings' collapsed.
+    LESS_SETTINGS_CLICKED: 3,
+    // User printed with extra settings expanded.
+    PRINT_WITH_SETTINGS_EXPANDED: 4,
+    // User printed with extra settings collapsed.
+    PRINT_WITH_SETTINGS_COLLAPSED: 5,
     // Max value.
-    PRINT_SETTINGS_UI_MAX_BUCKET: 2
+    PRINT_SETTINGS_UI_MAX_BUCKET: 6
   };
 
   /**
    * A context for recording a value in a specific UMA histogram.
    * @param {string} histogram The name of the histogram to be recorded in.
    * @param {number} maxBucket The max value for the last histogram bucket.
    * @constructor
    */
   function MetricsContext(histogram, maxBucket) {
     /** @private {string} */
@@ skipping 66 matching lines @@
 
   // Export
   return {
     Metrics: Metrics,
     MetricsContext: MetricsContext,
     DestinationSearchMetricsContext: DestinationSearchMetricsContext,
     GcpPromoMetricsContext: GcpPromoMetricsContext,
     PrintSettingsUiMetricsContext: PrintSettingsUiMetricsContext
   };
 });